Needham, T.; Lambrechts, H.; Hoffman, L.C. (9 November 2017). «Castration of male livestock and the potential of immunocastration to improve animal we». South African Journal of Animal Science47 (6): 731. doi:10.4314/sajas.v47i6.1.
Teske, E.; Naan, E. C.; Van Dijk, E. M.; Van Garderen, E.; Schalken, J. A. (2002). «Canine prostate carcinoma: epidemiological evidence of an increased risk in castrated dogs». Molecular and Cellular Endocrinology197 (1–2): 251–5. doi:10.1016/S0303-7207(02)00261-7. PMID12431819.
Lekcharoensuk; Osborne, C. A.; Lulich, J. P. (2001). «Epidemiologic study of risk factors for lower urinary tract diseases in cats». Journal of the American Veterinary Medical Association218 (9): 1429–35. doi:10.2460/javma.2001.218.1429. PMID11345305.
Teske, E.; Naan, E. C.; Van Dijk, E. M.; Van Garderen, E.; Schalken, J. A. (2002). «Canine prostate carcinoma: epidemiological evidence of an increased risk in castrated dogs». Molecular and Cellular Endocrinology197 (1–2): 251–5. doi:10.1016/S0303-7207(02)00261-7. PMID12431819.
Lekcharoensuk; Osborne, C. A.; Lulich, J. P. (2001). «Epidemiologic study of risk factors for lower urinary tract diseases in cats». Journal of the American Veterinary Medical Association218 (9): 1429–35. doi:10.2460/javma.2001.218.1429. PMID11345305.